ᐅ Duct Installation: Supply and Exhaust Air Above the Doors or in the Center of the Room?

Hello everyone,

As I just noticed in a brochure from Maico, there seem to be two approaches to installing a central mechanical ventilation system with heat recovery:

1) The one I have known so far involves routing the exhaust and supply air ducts so that their vents are installed in the middle of the room and as far away from the door as possible, either on the ceiling, floor, or wall, as shown here (planning by Selfio)

or

2) Routing the exhaust and supply air ducts only up to the doors, so that the duct runs in the hallway are as short as possible, as shown here (brochure from Maico)

My question is, who can assess which system is better? In planning discussions here on the internet, you mostly only hear about option 1. Is option 2 becoming more common now? Is it even possible to ensure sufficient air movement so that the mechanical ventilation system can work properly? Do any of you perhaps have option 2 and are satisfied with it?

Please let me know your thoughts.
Thank you

I can't understand how in option 2 any air exchange is supposed to take place in the room at the very back?!

Option 2 is the budget-friendly version. As a result, you get only limited mixing. However, you save about 1.5 meters (5 feet) of piping. Everyone has to decide for themselves what their priority is.

Maico might be using long-throw nozzles in the supply air there. It wouldn’t be my choice.

Supposedly, air circulation in rooms less than 6 meters (20 feet) deep is not an issue.

But no one has actually had any experience with this, right?

In our ventilation planning by Vaillant, the supply and exhaust air setup is similar to your Variant 1. I honestly cannot imagine how Variant 2 could work.

Edit1: You should have a ventilation concept created according to DIN 1946 for Variant 2 (or both).